Adding to auto-mode-alist in user-config does not work

[joefiorini]

Description

Using (add-to-list 'auto-mode-alist '("\\.blah\\'" . conf-mode)) does not apply conf-mode when opening a file ending in extension .blah.

Reproduction Steps

Most recently reproduced on a fresh checkout of master, with a brand new .spacemacs.d/init.el. Add:

(add-to-list 'auto-mode-alist '("\\.blah\\'" . conf-mode))

to the user-config section of .spacemacs.d/init.el. I then created a file called diddy.blah to a test directory.

Expected behavior

Looking up major-mode in C-h v shows the value is conf-mode

Actual behavior

Value of major-mode is Fundamental.

Note: I ran into this issue trying to set .js files to react-mode automatically. In troubleshooting I found this seems to be a more general problem and reproduced using the example above on a fresh installation of master. On Gitter.im @TheBB could not reproduce this, so I'm curious if this is something with my machine or an issue with Spacemacs.

[joefiorini]

I found today that if I add the add-to-list line at the end of ~/.emacs.d/init.el (yes, the main Spacemacs init file, not my dotspacemacs file) it works great. I took it out (but it's still in user-config section of ~/.spacemacs.d/init.el) and my .js files do not get react-mode again.

[StreakyCobra]

I can't reproduce it. With a clean .spacemacs, adding your line at the end of user-config works and set mode to for diddy.blah to conf-unix-mode.

[mkomitee]

Are you using the auto-layouts feature?

[joefiorini]

It seems to be working okay for me now after a couple updates. Closing this issue.

[baig]

This is not working for me as of today.

[JuneKelly]

I've just encountered a similar problem. Adding to auto-mode-alist doesn't work in the user-config function in .spacemacs, but it does work if the same expression is added to the end of .emacs.d/init.el

For reference, mine was (add-to-list 'auto-mode-alist '("\\.vue\\'" . web-mode))

[d12frosted]

I know it sounds silly, but I have to ask. Did you evaluate that expression or reload configuration? 😸

[JuneKelly]

Yeah, I closed emacs entirely and reloaded between edits to test :)

EDIT: If I find time this week I'll do some isolated testing in a VM

[d12frosted]

What is the value of auto-mode-alist after you restart emacs? Does it have ("\\.vue\\'" . web-mode)?

P. S. adding that pair to auto-mode-alist in user-config works for me.

[ibeckermayer]

I'm having this same issue

[mshogin]

I'm having the same issue

(add-to-list 'python-shell-extra-pythonpaths "/path/to/lib1/")
(add-to-list 'python-shell-extra-pythonpaths "/path/to/lib2/")